If the radius of a circle is 10 cm, what is the area?

Using the formula $$A=\pi r^2$$ , the area is approximately 314.16 cm².

What is the value of $$\pi$$ ?

$$\pi$$ is approximately 3.14, but it is an irrational number with a non-repeating decimal.

What is the circumference of a circle?

The circumference is the distance around the circle, calculated using $$C=2\pi r$$ .

How do you find the radius if you know the area of the circle?

You can find the radius using the formula $$r=\sqrt{\frac{A}{\pi}}$$ .

What is the area of a circle with a radius of 5 cm?

Using the formula $$A=\pi r^2$$ , the area is approximately 78.54 cm².

What is the formula for the circumference of a circle?

The formula for the circumference is $$C=\pi d$$ or $$C=2\pi r$$ .

If the diameter of a circle is 20 cm, what is the radius?

The radius is half of the diameter, so the radius is 10 cm.

What is the area of a circle with a diameter of 12 cm?

First, find the radius: $$r=\frac{d}{2}=6 cm$$ . Then, use the area formula: $$A=\pi r^2$$ , which gives approximately 113.10 cm².

Area of Circles Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

2.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Tags

CCSS.HSG.C.A.2

3.

FLASHCARD QUESTION

Front

If a circular pie has an area of 706.5 cm², what is the radius?

Back

Tags

CCSS.7.G.B.4

4.

FLASHCARD QUESTION

Front

What is a radius in a circle?

Back

A radius is a line segment from the center of the circle to any point on its circumference.

5.

FLASHCARD QUESTION

Front

What is a diameter in a circle?

Back

A diameter is a line segment that passes through the center of the circle and has its endpoints on the circle.

6.

FLASHCARD QUESTION

Front

How do you calculate the area of a circle if you know the diameter?

Back

Tags

CCSS.7.G.B.4

7.

FLASHCARD QUESTION

Front

What is the relationship between radius and diameter?

Back

Tags

CCSS.7.G.B.4

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